DC-to-DC bidirectional voltage converters and current sensor
First Claim
Patent Images
1. A method for controlling a voltage converter (30, 40, 50, 60, 300) of the type comprising:
- an inductive element (1, Lp, Ls) adapted to store energy in a magnetic form,a first chopping switch (Tp) and a first diode (Dp) in parallel, forming with the inductive element (Lp) a primary circuit connected to a DC supply voltage source (Vin),at least a second chopping switch (Ts) and a second diode (Ds) in parallel, forming with the inductive element (Ls) at least a secondary circuit providing a load (Cout, Z) with an output voltage (Vout) of the converter,said method comprising the steps ofcontrolling said switches (Tp, Ts) to achieve operation cycles of the converter so that each cycle includes a primary period (T1) during which the first switch (Tp) is on and the second switch (Ts) is off, and a secondary period (T3) during which the second switch (Ts) is on and the first switch (Tp) is off,determining the duration of the secondary period (T3) by a calculation means, andtriggering the switching-off of the secondary switch (Ts) when the calculated duration of the secondary period (T3) is ended;
wherein the duration of the primary period (T1) is determined by the switching-off of the first switch (Tp) which is triggered when a current (Ip) in the primary circuit is higher than a control signal (G(ε
)) depending upon the difference (ε
) between the output voltage of the converter (Vout) and a reference voltage (Vref).
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Abstract
A bidirectional voltage converter comprises an inductive element, a primary circuit having a first chopping switch and a first diode, and at least a secondary circuit having a second chopping switch and a second diode. The first switch is switched on upon reception of a start-up signal of the primary period, and switched off when the current in the primary circuit is higher than a control signal. The second switch is switched on upon reception of a start-up signal of the secondary period, to calculate the duration of the secondary period, to count this duration, and switched off when this duration is ended.
86 Citations
18 Claims
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1. A method for controlling a voltage converter (30, 40, 50, 60, 300) of the type comprising:
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an inductive element (1, Lp, Ls) adapted to store energy in a magnetic form, a first chopping switch (Tp) and a first diode (Dp) in parallel, forming with the inductive element (Lp) a primary circuit connected to a DC supply voltage source (Vin), at least a second chopping switch (Ts) and a second diode (Ds) in parallel, forming with the inductive element (Ls) at least a secondary circuit providing a load (Cout, Z) with an output voltage (Vout) of the converter, said method comprising the steps of controlling said switches (Tp, Ts) to achieve operation cycles of the converter so that each cycle includes a primary period (T1) during which the first switch (Tp) is on and the second switch (Ts) is off, and a secondary period (T3) during which the second switch (Ts) is on and the first switch (Tp) is off, determining the duration of the secondary period (T3) by a calculation means, and triggering the switching-off of the secondary switch (Ts) when the calculated duration of the secondary period (T3) is ended; wherein the duration of the primary period (T1) is determined by the switching-off of the first switch (Tp) which is triggered when a current (Ip) in the primary circuit is higher than a control signal (G(ε
)) depending upon the difference (ε
) between the output voltage of the converter (Vout) and a reference voltage (Vref). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A voltage converter (30, 40, 50, 60, 300) including:
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an inductive element (1, Lp, Ls) adapted to store energy in a magnetic form, a first chopping switch (Tp) and a first diode (Dp) in parallel, which form with the inductive element a primary circuit connected to a DC supply voltage source (Vin), at least a second chopping switch (Ts) and a second diode (Ds) in parallel, which form with the inductive element at least a secondary circuit supplying a load (Cout, Z) with a converter output voltage (Vout), a system (70, 80,
90) for controlling said switches to achieve operation cycles including a primary period (T1) for the flowing of a current (Ip) through said primary circuit, during which the first switch (Tp) is on and the second switch (Ts) is off, and a secondary period (T3) for the flowing of a current (Is) through the secondary circuit during which the second switch (Ts) is on and the first switch (Tp) is off,means (61, 62, 70, 71, 72, 91,
95) for switching on the first switch (Tp) upon reception of a signal (S, T4'"'"') to start-up the primary period (Ti), and for switching off the switch when the current (Ip) in the primary circuit is higher than a control signal (G(ε
)) depending upon the difference (ε
) between the converter output voltage (Vout) and a reference voltage (Vref),means (80, 81, 82, 85, 86, 87, 93, 97, 100,
102) for switching on the second switch (Ts) upon reception of a signal (S(T2'"'"'), Hs'"'"') to start-up the secondary period (T3), to calculate the duration of the secondary period (T3), to count said duration and to switch-off the secondary switch (Ts) when said duration is ended. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification